This wooden truss beam is set up at the factory and conveyed to the construction site by a trailer.
这个木制的桁梁在工厂中被准备，并用拖车运送到施工现场。
The wooden structure or welded steel truss structure greenhouse, we must ensure that each year make a deal with anti-corrosion surface.
对于木结构或钢筋焊接桁架结构温室，必须保证每年作一次表面防腐处理。
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